Zynex, Inc. manufactures and markets medical devices that treat chronic and acute pain, as well as activate and exercise muscles for rehabilitative purposes with electrical stimulation. The Company operates through medical devices segment, which include electrotherapy and pain management products. The Company conducts its business through its subsidiaries and the operating subsidiary is Zynex Medical, Inc. (ZMI). The Company’s devices are intended for pain management to reduce reliance on drugs and provide rehabilitation and mobility through the utilization of non-invasive muscle stimulation, electromyography technology, interferential current (IFC), neuromuscular electrical stimulation (NMES) and transcutaneous electrical nerve stimulation (TENS). The Company's devices are small, portable, battery-operated and include an electrical pulse generator that is connected to the body via electrodes.